Tin bronze and their characteristics.

During fusion of copper and tin formed solid solutions, is strongly prone to phase separation due to crystallization of a large temperature range. Alloys with the tin content of more than 5% due to segregation in the structure have eutectoid component E (a + d), consisting of hard and soft phases.

The structure of this type is advantageous for parts of plain bearings: solid particles produce wear, the soft phase provides an excellent running-in connection, tin bronze are excellent anti-friction materials.

Their main disadvantage is the formation of pores in the casting, which leads to their low leakage. Tin bronze alloyed with nickel, lead, zinc, phosphorus.

Casting and technological characteristics of the alloy BrOTsS4−3

hot working temperature

700−800 ° C

Melting temperature

1045 ° C

annealing temperature

550 — 650 ° C

Legend:

— Tensile strength (strength Tensile), in MPa

σ in

— Relative precipitate at cracking in%

å

— Yield strength, in MPa

σ 0,05

— Strength limit torsional (shear stress limit), in MPa

Jê

— Conventional liquid limit in MPa

σ 0,2

— Strength limit bending in MPa

σizg

— Elongation after rupture in%

δ5, δ4, δ10

— Endurance limit under cyclic symmetric load on a bend, in MPa

σ-1

— Compression (yield point), in MPa

σszh0,05 and σszh

— Endurance limit at symmetric cyclic loading torsional MPa

J-1

— A relative shift in%

ν

— The number of load cycles

n

— Intermittent Strength limit in MPa

sre

— Beats. the electrical resistance in ohm · m

R and ρ

— Reduction in%

ψ

— Nominal modulus in GPa

E

— Toughness for the samples with concentrators in accordance with the type V and U, in J / cm 2

KCU and KCV

— Test temperature, ° C

T

— Yield point — residual deformation (proportional limit), in MPa

sT

— Coefficient of thermal conductivity in W / (m · ° C)

l, and ë

— Brinell hardness according to

HB

— Specific heat capacity in [J / (kg · °)]

C

— Hardness according to Vickers

HV

— Specific weight kg / m 3

and r pn

— Hardness according to Rockwell, wk. FROM

HRC

— Coefficient of linear thermal expansion (1 / ° C)

— Hardness according to Rockwell, wk. AT

HRB

— The boundary of long-term strength (MPa)

σtT

— Hardness according to Shore

HSD

— Modulus of elasticity (shear twisting) GPa

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